TY - GEN
T1 - Quarternary and quinary additions to directionally-solidified X-X 3Si eutectics of chromium and vanadium
AU - Ang, J.
AU - Vorontsov, V. A.
AU - Hayward, C. L.
AU - Balakrishnan, G.
AU - Stone', H. J.
AU - Rae, C. M.F.
N1 - Funding Information:
The generous financial support from Rolls-Royce plc., access to both the expertise and high temperature stress rig of Professor K. Sharvan Kumar in the Division of Engineering, Brown University, Mr. Kevin Roberts’ aid in alloy manufacture at the University of Cambridge, financial support from EPSRC UK, are all gratefully acknowledged.
PY - 2011
Y1 - 2011
N2 - An alternative high temperature structural alloy system based on the X-X3Si eutectic compositions of chromium and vanadium is put forward. These low-density (∼6g/cm3) eutectics have a bcc solid-solution to increase alloy fracture toughness, and a A15 X3Si as the high temperature load-bearing phase. (1/2Cr,1/2V)-(1/2Cr,1/2V)3Si was used as the base alloy for further element additions, and is represented by the symbol Cyrillic capital letter E. 10at.% tantalum and aluminium were substituted for vanadium as quaternary and quinary alloy additions. Microstructure, elemental phase partitioning, compression creep and oxidation results will be discussed. Cr-Cr3Si has a tidy, fine lamellar microstructure. Vanadium coarsens and destabilises the lamellae to a limited extent. Tantalum addition causes two distinct populations of eutectic to form; one population having finer lamellae than the other. Aluminium does not coarsen or destabilise the lamellar microstructure. High temperature compression tests at 1200°C and 1300°C show that Cyrillic capital letter E is stronger than the binary alloys, and of similar strength to the quaternary and quinary alloys.
AB - An alternative high temperature structural alloy system based on the X-X3Si eutectic compositions of chromium and vanadium is put forward. These low-density (∼6g/cm3) eutectics have a bcc solid-solution to increase alloy fracture toughness, and a A15 X3Si as the high temperature load-bearing phase. (1/2Cr,1/2V)-(1/2Cr,1/2V)3Si was used as the base alloy for further element additions, and is represented by the symbol Cyrillic capital letter E. 10at.% tantalum and aluminium were substituted for vanadium as quaternary and quinary alloy additions. Microstructure, elemental phase partitioning, compression creep and oxidation results will be discussed. Cr-Cr3Si has a tidy, fine lamellar microstructure. Vanadium coarsens and destabilises the lamellae to a limited extent. Tantalum addition causes two distinct populations of eutectic to form; one population having finer lamellae than the other. Aluminium does not coarsen or destabilise the lamellar microstructure. High temperature compression tests at 1200°C and 1300°C show that Cyrillic capital letter E is stronger than the binary alloys, and of similar strength to the quaternary and quinary alloys.
UR - http://www.scopus.com/inward/record.url?scp=80053187022&partnerID=8YFLogxK
U2 - 10.1557/opl.2011.351
DO - 10.1557/opl.2011.351
M3 - Conference contribution
AN - SCOPUS:80053187022
SN - 9781605112725
T3 - Materials Research Society Symposium Proceedings
SP - 391
EP - 396
BT - Intermetallic-Based Alloys for Structural and Functional Applications
T2 - 2010 MRS Fall Meeting
Y2 - 29 November 2010 through 3 December 2010
ER -